Family dynamics are all kinds of weird. People hold grudges for decades. People form impressions of each other that have nothing to do with reality and can’t be changed by reality.
You could do anything. You could get in his face and yell and scream. You could lobby others to talk to him. You could reason with him. You could kick him in the balls. You could wait. Say nothing.
It kind of depends on what he’s trying to do. Maybe he’s trying to rile you up. If so, he has probably riled you in the past and you fall for it. You defend yourself. He probably doesn’t care whether he’s right or wrong. He just wants to make you angry.
Or maybe he’s a bitter person. He just sees the world as bad, and you are part of the badness. He’s just complaining.
Or maybe he thinks you are lazy and he thinks he can change you.
Or maybe…
I don’t know. You are the only one with the information needed to even begin to understand this. No one here can help. We don’t know anything. Which means you’re just complaining. Which means I will say I’m sorry you’re going through this, and I hope it gets better.